Best Cold Air Intake for the Focus ST?

I bought a green filter and installed it without the lid. I get the sounds and no gain you get out of a full CAI for 50 bucks.

RS airbox, 80 bucks and done. There is no power gain, they flow more than enough air as it is. Just noise.

I have the injen an I love it!! Adds a lot of turbo noise an you can here the stock bpv also.

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Are these no tune needed CAI's?

I guess technically (varies by person), stage 1 is CAI or filter and a cat back exhaust. But I am confident that you can run both without a tune (I did it). I am also confident that you could run a stage 1 tune without a CAI/filter and cat back.

I replaced the stock exhaust at like 800 miles since the stock exhaust sucks so bad it could take the hair off a donkeys nuts from 100 yards. The air filter came shortly after that. I ran both for a couple thousand miles before I got an AP.

This topic has been beat to death. The consensus seems to be that the stock intake piping is suitable to flow enough air to our tiny turbo. Replacing the paper filter with an aftermarket filter is the best bang for your buck. Other than that, it just comes down to which one is more aesthetically pleasing to you in regards to piping


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Get a green filter. Like turbo noise? Take top cover off. Want less turbo noise? Put cover back on.

I bought an injen intake just because I think the rubber elbow that goes to the filter is ugly. And the filter doesn't have to be oiled which I find convenient. Just turn the regulator down on the air compressor and blow it out from the inside and you're done.

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Best CAI is no CAI, slap a small filter on the intake side of the turbo. boom more powa. OR instead of going over the whole hot engine block with a pipe, simply add a 90 d. elbow to the turbo, cut a 3 ' hole in the plastic put the straight tube through the plastic and boom instant intake stack. The front passenger has a great view of a intake.

Green filter with stock tube ftw

Thanks for your opinions guys. Based upon my budget and what I am sensing... it is best to just replace the airfilter with either a Green Filter or a K&N and leave the airbox alone for now. (Might get CAI when i get an MBRP exhaust) but for now it appears the noise from a CAI compared to a re-usable filter with stock airbox, doesnt make much of a difference in both power and noise.

MJDardas said:

Thanks for your opinions guys. Based upon my budget and what I am sensing... it is best to just replace the airfilter with either a Green Filter or a K&N and leave the airbox alone for now. (Might get CAI when i get an MBRP exhaust) but for now it appears the noise from a CAI compared to a re-usable filter with stock airbox, doesnt make much of a difference in both power and noise.

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It's been said before, not just by me,
AEM dry filter has better filtration than green and K&N, still flows more than stock, doesn't require oiling, and can be had for $40. If you want sound you can leave the lid off. Enjoy

Blackula said:

It's been said before, not just by me,
AEM dry filter has better filtration than green and K&N, still flows more than stock, doesn't require oiling, and can be had for $40. If you want sound you can leave the lid off. Enjoy

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Yup...surprised this actually isn't pushed around here more than it is. Don't know why the Green gets all the hype.

galaxy7 said:

Yup...surprised this actually isn't pushed around here more than it is. Don't know why the Green gets all the hype.

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I think it's the open end. I think the only open-ended dry filter I could find was Airaid and it had a special box/lid to go with it, was more expensive and nobody was running it. Coming from a turbo outback, my symposer delete, closed airbox and stock exhaust sounds fine for me right now. Maybe down the road I will do res delete.

doesn't leaving the lid of the airbox off create more heat in the engine bay? Not something i really wanted to do. AEM dry filter does seem like a good buy, but if it doesnt offer any sound difference the only purpose of it is for re-usability